Family Ackermann/ Maurmann from Wuppertal-Barmen

Family Ackermann/ Maurmann from Wuppertal-Barmen

I am searching for information regarding my grandparents Friedrich Ackermann (1899-1950) and my grandmother Hildegard Maurmann Ackermann (1900-1993). I do not seem to have any luck finding any information (birth records, etc.) on them. I know my grandfather had a Werkzeug and Maschinenfabrick Friedrich Ackermann in Wuppertal. Any information would be wonderful.